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How to watch Super Tuesday nominating contests tonight

On Tuesday, voters in 13 states and one U.S. territory head to the polls or caucus sites to participate in their state's primary or caucuses. It's a critical night for candidates as they seek to build momentum on the path toward the parties' nominations.

Hillary Clinton or Bernie Sanders are the two candidates left in the Democratic race while five contenders remain in the Republican race: Donald Trump, Marco Rubio, Ted Cruz, John Kasich and Ben Carson.

  • Watch CBSN for coverage of Super Tuesday at 1 p.m. EST

Republicans and Democrats are holding primaries in Alabama, Arkansas, Georgia, Massachusetts, Oklahoma, Tennessee, Texas, Vermont and Virginia. The two parties are also holding caucuses in Colorado and Minnesota. Only Republicans are holding caucuses in Alaska and *Wyoming and Democrats hold caucuses in American Samoa. *Wyoming's GOP caucuses are held at different times based on each county/precinct, but all will be completed by the end of the day on Super Tuesday.

Polls close in most states at either 7 p.m. or 8 p.m. Results from the GOP caucuses in Alaska will continue until midnight EST. Most states' primaries are open whereby registered voters can participate in either party's primary. A few states hold closed primaries or caucuses in which only registered voters of a political party can vote to select their party's nominees.

Alabama 7 p.m. CST (8 p.m. EST)

Alaska 8 p.m. AKST (midnight EST)

Arkansas 7:30 CST (8 p.m. EST)

Colorado 7 p.m. MST (9 p.m. EST)

Georgia 7 p.m. EST

Massachusetts 8 p.m. EST

Minnesota 8 p.m. CST (9 p.m. EST)

Oklahoma 7 p.m. CST (8 p.m. EST)

Tennessee 7 p.m. CST (8 p.m. EST)

Texas 8 p.m. CST (9 p.m. EST)

Vermont 7 p.m. EST

Virginia 7 p.m. EST

Wyoming 10 p.m. MST (midnight EST)

More than 1,500 delegates are up for grabs on Tuesday. Republican candidates have the opportunity to win about half of the 1,237 delegates needed to win the nomination.

Over a third of delegates needed to win the Democratic nomination are also up for grabs. Most states will award their delegates proportionally for the Republicans instead of on a winner-take-all basis. Democrats award all of their delegates proportionally, except for super delegates, who are party officials who can commit to supporting whomever they want.

Polls show Trump and Clinton are leading in a number of states participating in Super Tuesday. A CBS News poll released Sunday, for example, found Clinton has at least a 20-percentage-point lead in Georgia, Virginia and Texas.

A national CNN/ORC poll released Monday showed Trump and Clinton lead in their respective races. Nearly half of Republicans across the country said they support Trump while 16 percent back Marco Rubio and Ted Cruz received 15 percent support.

These polls come as the attacks have escalated among Republican candidates. Trump and Rubio have been trading personal attacks, which appeared to escalate over the weekend. After Trump called the Florida senator "Little Marco," Rubio shot back and said that Trump has "small hands" and "the worst spray tan in America."

Candidates have also criticized Trump for refusing to denounce Ku Klux Klan leader David Duke and the KKK when he was asked whether he would disavow Duke on political talks shows Sunday morning.

Kasich, meanwhile, is trying to stay above the fray and avoid personal attacks with any of his rivals.

In the Democratic race, Clinton has won three out of the first four nominating contests: Iowa caucuses, Nevada caucuses and South Carolina's primary. Sanders won the New Hampshire primary.

In the Republican race, Donald Trump has one three of the first four nominating contests: New Hampshire's primary, South Carolina's primary and Nevada's caucuses. Ted Cruz won the Iowa caucuses.

→ What: Super Tuesday

CBSN election coverage begins at 1 p.m. EST

→ Where: 13 states and one U.S. territory

→ When: Polls will close in most states at either 7 p.m. or 8 p.m. EST

CBS News' Stephanie Condon and Emily Schultheis contributed to this story.

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